package targetToOffer.firstDay;

import java.util.HashMap;

/**
 * @author Godc
 * @description
 */
public class CopyRandomList {
}
class CopyRandomListSolution {
    /**
     * HashMap做法
     * @param head
     * @return
     */
    public Node copyRandomList(Node head) {
        if(head == null)
            return null;
        HashMap<Node, Node> map = new HashMap<>();
        Node cur = head;
        while(cur!=null){
            map.put(cur,new Node(cur.val));
            cur = cur.next;
        }
        cur = head;
        while(cur!=null){
            map.get(cur).next = map.get(cur.next);
            map.get(cur).random = map.get(cur.random);
            cur = cur.next;
        }
        return map.get(head);
    }
}
class Node {
    int val;
    Node next;
    Node random;

    public Node(int val) {
        this.val = val;
        this.next = null;
        this.random = null;
    }
    
}